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Questions and Answers
What is a primary objective of protected cultivation?
Which of the following is NOT an example of a method used for crop protection in greenhouses?
Which greenhouse orientation is recommended for maximizing sunlight exposure?
Which of the following is a disadvantage associated with greenhouses?
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Which material can be used to create windbreaks around a greenhouse?
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What type of greenhouse is most appropriate for maximum radiation energy absorption in cloudy areas?
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Which type of greenhouse is primarily used in cold areas?
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What is the typical slope angle range for the walls of a mansard roof greenhouse?
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Which type of greenhouse is best suited for uneven terrain?
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What structural form characterizes a greenhouse with a roof steeper than the upper roof?
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Study Notes
Protected Cultivation
- Aims to produce high-value products.
- Involves growing crops in controlled environments, like greenhouses.
- Addresses unfavorable conditions such as low solar radiation, water/nutrient levels, and weeds.
Greenhouse Design
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Orientation:
- North-South recommended for optimal sunlight.
- East-West orientation is suitable for locations above 30º North or South latitude.
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Greenhouse Structures:
- Gothic Arch: Semi-circular shape.
- Quonset: Curved structure.
- Mansard Roof: Walls slope at 60-70° angles.
- Lean-to: Cost-effective, built adjacent to a building.
- Gable Even Span: Most common, suitable for all crops.
- Uneven Span: One side of the roof is longer than the other.
- Ridge and Furrow: Prone to wind and snow issues.
- Paraboloid Hyperbolic: Suitable for cold areas.
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Location Factors:
- Proximity to markets, roads, and water sources.
- Windbreaks are essential, preferably located on the north and west sides.
- Distance from buildings: Windbreaks should be 100-200 feet away from structures.
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Foundation Considerations:
- Built on a concrete slab, using materials like cement and wood.
- Porous concrete in flooring allows water drainage.
- Wood requires treatment to prevent corrosion.
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Types of Soilless Growing Systems:
- Hydroponics: Growing plants without soil, known for higher productivity and reduced water usage.
- Sand Culture: Similar to hydroponics, but uses sand as a medium.
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Greenhouse Cover Materials:
- Glass: Offers high light transmittance and durability.
- Fiberglass: Affordable and durable, often chosen for greenhouse covers.
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Greenhouse Layout:
- Connected Greenhouses: Require more heat than separate greenhouses.
- Separate Greenhouses: Easier to expand or contract production.
- Oval Layout: Reduces dimensional issues compared to rectangular layouts.
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Description
This quiz covers the principles of protected cultivation aimed at producing high-value crops in controlled environments like greenhouses. It also explores various greenhouse designs, their orientations, and key structural features to optimize crop growth under different conditions.
